flatten list of list through list comprehension

Question

I am trying to flatten a list using list comprehension in python. My list is somewhat like

[[1, 2, 3], [4, 5, 6], 7, 8]

just for printing

Answer 1

You're trying to iterate through a number, which you can't do (hence the error).

If you're using python 2.7:

>>> from compiler.ast import flatten
>>> flatten(l)
[1, 2, 3, 4, 5, 6, 7, 8]

But do note that the module is now deprecated, and no longer exists in Python 3